They're usually military bullets pulled when demilitarizing ammunition. The pulling process has the potential to alter the shape, and it's been done better by some outfits than by others. I suggest you buy a sample and try them if you don't mind military ball ammunition accuracy. Probably be fine on steel plates, but don't expect to win any conventional pistol bullseye matches with them.
Regarding shape, most every bullet shape has its own COL range for best performance and function. Just part of the fun of reloading.